Re: Resend: patch: qemu + hugetlbfs..

[Avi Kivity <avi@qumranet.com>]

john cooper wrote:
> This patch from over a month ago doesn't seem to have
> made it into kvm-73 and may have been lost in the
> shuffle.  Attached is essentially the same patch but
> as applied to kvm-73, and validated relative to that
> version.
>

I must have missed it.  Thanks for persisting.

> In a nutshell the intention here is to allow
> preallocation of guest huge page backed memory at
> qemu initialization time to avoid a quirk in the
> kernel's huge page accounting allowing overcommit
> of huge pages.  Failure of the kernel to resolve a
> guest fault to overcommitted huge page memory during
> runtime results in sigkill termination of the guest.
> This patch provides the option of avoiding such
> behavior at the cost of up-front preallocation of
> physical huge pages backing the guest.
>

What is the motivation for providing an option to disable this?  If we 
can detect mem-path is backed by huge pages somehow, I think we can 
prefault the memory unconditionally.

-- 
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